Quantum computing takes over the mining game and raises the difficulty to mine astronomically in a short period. That mixed with high electricity prices cuts the average Bitcoiner out off the mining game completely .

Quantum computing takes over the mining game and raises the difficulty to mine astronomically in a short period. That mixed with high electricity prices cuts the average Bitcoiner out off the mining game completely .

Some alien might just come and start mining with their USB size machine which speed is 1000 PH/s...

I think in the year 2020 one BTC will be worth around $500 (USD-2011). In nominal terms that might come around 700 to 1000, I expect inflation to be picking up. Millibitcoin will be used for small transactions.

Somehow it seems this particular prediction (500$) is about to become reality in November 2013. Most people simply have no vision.